DISSECTION OF THE HEAD AND NECK 373 



fibres in middle, and leg fibres behind), into basis pedunculi, to 

 motor nuclei of cerebral nerves and to anterior horns of spinal 

 cord. 



(2) "Accessory lernniscus" of v. Bechterew, from cortex to motor 



nuclei of cerebral nerves. 



(3) Frontal corticopontile path (fasciculus corticopontilis frontalis), 



from posterior part of frontal lobe, through frontal limb of 

 capsula interna and through medial part of basis pedunculi 

 (Arnold's bundle), to nuclei pontis. 



(4) Temporal corticopontile path (fasciculus corticopontilis tempo- 



ralis ) . 



(5) Occipitomesencephalic path (fasciculus occipitomesencephalica) 



(0. T. secondary optic radiation of Flechsig), fibres from visual 

 sense area about fissura calcarina, downward through occipito- 

 thalamic radiation to superior colliculus. 



(6) Projection fibre systems of central olfactory paths. 



(a) Hippocanipo-mammillary fibre system, going from cells in 

 hippocampus, through fornix and columna for- 

 nicis, to nuclei corporis mammillaris of same and 

 of opposite side; there connecting with 



(aa) Principal mammillary fasciculus (fasciculus mam- 



millaris princeps), which divides into 



(aaa) Thalamomammillary fasciculus (fascicu- 



lus thalamomammillaris [Vicq d'Azyri]), 

 going to nucleus anterior thalami, and 



(aab) Tegmental part of pedunculomammillary 



fasciculus (fasciculus pedunculomammil- 

 laris, pars tegmentalis), to the tegmen- 

 tum of the cerebral peduncle. 



(ab) Basilar part of pedunculomammillary fasciculus 



(fasciculus pedunculomammillaris, pars basilaris) 

 (0. T. peduncle of mammillary body). 



II. ASSOCIATIVE FIBRE SYSTEMS. 



(A) Connecting different parts of same hemisphere. 



(a) Those with short axones, including the fibrae propriae of the gyri 



cerebri. 



(b) Those with long axones. 



(ba) Cingulum (cingulum) (" girdle"), in the gyrus cinguli and 



gyrus hippocampi. 



(bb) Superior longitudinal fasciculus (fasciculus longitudinalis 



superior), extending between lobus frontalis and lobus 



occipitalis. 

 (be) Inferior longitudinal fasciculus (fasciculus longitudinalis 



inferior), between lobus occipitalis and more anterior 



parts of brain. 

 (bd) Uncinate fasciculus (fasciculus uncinatus), between uncus 



and base of lobus frontalis. 



(B) Connecting the two hemispheres with each other (commissural fibre sys- 



tems). 



(a) Corpus callosum (corpus callosum) ("callous" or " hard" body). 



(b) Anterior commissure of cerebrum (commissura anterior [cerebri]). 



(c) Commissure of hippocampus (commissura hippocampi). 



